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基于虚拟同步控制的双馈风电机组预同步并网策略
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新疆大学电气工程学院

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国家自然科学基金(51667018)


Pre-Synchronous Grid-connection Strategy of DFIG-based Wind Turbine With Virtual Synchronous Generator Control
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    摘要:

    采用虚拟同步控制的双馈风电机组能提高电网惯量和频率支撑能力,成为实现可再生能源友好并网的有效途径之一。基于虚拟同步控制的双馈风电机组直接参与电网并网时,由于缺少预同步锁相控制,双馈风机定子与电网的电压幅值和初始相位可能存在偏差。针对上述存在的并网问题,提出一种虚拟同步控制的双馈风电机组无锁相环预同步控制策略。通过在虚拟同步外环控制中加入频率相位控制器和幅值预同步控制器,可以控制双馈风电机组并网前定子频率、相位和电压幅值与电网相同,并提出在无功-电压环中引入虚拟阻抗,实现了双馈风机快速有效地平滑并网。理论分析和仿真结果验证了无锁相环预同步控制方案对虚拟同步双馈风电机组并网的有效性。

    Abstract:

    The doubly-fed induction generator(DFIG)wind turbine with virtual synchronous control can improve the inertia and frequency support capacity of the power grid and become one of the effective ways to achieve the friendly grid-connection of renewable energy. When DFIG wind turbine based on virtual synchronous control is directly involved in grid connection, the voltage amplitude and initial phase of DFIG stator may be out of alignment with the grid due to the lack of pre-synchronous phase-locked control. In order to solve the above problems, a virtual synchronous control strategy for DFIG wind turbine without phase-locked loop is proposed. By adding frequency-phase controller and amplitude pre-synchronization controller to the virtual synchronous outer loop control, the stator frequency, phase and voltage amplitude of DFIG wind turbine can be controlled to be the same as that of the power grid, the virtual impedance is introduced into the reactive power-voltage loop to realize the fast and effective smooth grid-connection of DFIG wind turbine. Theoretical analysis and simulation results verify the effectiveness of the without phase-locked loop pre-synchronization control scheme for virtual synchronous DFIG wind turbine.

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周鹏,张新燕,邸强,等.基于虚拟同步控制的双馈风电机组预同步并网策略[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20191224010.
ZHOU Peng,ZHANG Xinyan,DI Qiang,et al.Pre-Synchronous Grid-connection Strategy of DFIG-based Wind Turbine With Virtual Synchronous Generator Control[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20191224010.

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  • 收稿日期:2019-12-24
  • 最后修改日期:2020-05-12
  • 录用日期:2020-03-24
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